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Senior Software Engineer - Systems Jobs (Hybrid work)

445 Job Offers

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Senior Software QA Engineer
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Join Inetum Polska in Warsaw as a Senior Software QA Engineer. Design and automate tests with Playwright/JavaScript for a key telecom e-commerce platform. Enjoy a hybrid model, flexible hours, and strong development support in an inclusive culture.
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Poland , Warsaw
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Not provided
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Inetum
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Senior .Net Software Engineer
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Join our Warsaw team as a Senior .NET Software Engineer. Develop a custom CRM and back-end systems using C#, .NET, and SQL for a global telecom client. Enjoy a hybrid model, flexible hours, and strong mentorship in a supportive culture.
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Poland , Warsaw
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Inetum
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Senior JVM Software Engineer
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Seeking a Senior JVM Software Engineer in Warsaw for a hybrid role. Drive feature development (70% BE/30% FE) using Java, Spring Boot, React, and PostgreSQL. Enjoy flexible hours, a cafeteria system, and a supportive culture with technical mentoring. Join a telecom project requiring 4+ years of f...
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Poland , Warsaw
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Inetum
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Senior iOS Software Engineer
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Join our Warsaw team as a Senior iOS Software Engineer, also leveraging Android expertise. Develop innovative mobile solutions using Swift, Kotlin, and modern architectures like MVVM and SwiftUI. Enjoy a hybrid model, flexible hours, and a rich benefits package including mentoring and a cafeteria...
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Poland , Warsaw
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Inetum
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Senior Python Software Engineer
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Join Inetum Polska as a Senior Python Software Engineer in Warsaw. Develop AI-driven microservices with Python, FastAPI, and PostgreSQL on Azure. Enjoy a hybrid model (3 days office/week), flexible hours, and strong mentorship in an innovative team.
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Poland , Warsaw
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Inetum
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Senior Java Software Engineer
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Join our Warsaw team as a Senior Java Engineer. Lead the migration of JBoss systems to a modern Spring Boot cloud environment using Java 17+, Camunda, and Kubernetes. Enjoy a hybrid model, flexible hours, and a rich benefits package including mentoring and a team-building budget. Apply your exper...
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Poland , Warsaw
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Inetum
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Senior Software Engineer
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Join a Cambridge-based quantum computing leader as a Senior Software Engineer. Develop cutting-edge cloud infrastructure using Python, AWS/Azure, and Terraform. Enjoy flexible work, equity, and collaborate with world-class innovators on revolutionary quantum AI and cybersecurity platforms.
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United Kingdom , Cambridge
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Gitmax
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Senior Frontend Software Engineer
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Join KAYAK as a Senior Frontend Engineer in Cambridge, USA. Build the Flights product used by millions, owning UI end-to-end with React/TypeScript. Enjoy great benefits like flexible hours, 4 weeks vacation, and a focus on work-life balance.
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United States , Cambridge
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KAYAK
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Senior Front-End Software Engineer
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Join KAYAK as a Senior Frontend Engineer in Kaunas. You will build innovative checkout flows and B2B platforms using React, TypeScript, and modern tooling. This hybrid role offers global collaboration, career growth funds, and extensive benefits.
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Lithuania , Kaunas
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3333.00 - 6600.00 EUR / Month
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KAYAK
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Senior Network Software Engineer
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Join Aruba, an HPE company, as a Senior Network Software Engineer in San Jose. Develop next-gen packet forwarding solutions, including stateful firewall, SDN, and scalable cloud applications. We seek an expert in C programming, networking protocols, and embedded/cloud systems with 6-10 years' exp...
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United States , San Jose
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133500.00 - 307000.00 USD / Year
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Hewlett Packard Enterprise
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Senior Software Development Engineer - Routing/SASE
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Join Hewlett Packard Enterprise in San Jose as a Senior Software Development Engineer. You will design and maintain routing protocols like BGP and OSPF for our SASE platform, using your expert C programming skills. This role offers a chance to lead innovative projects within a culture that values...
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United States , San Jose
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117500.00 - 270000.00 USD / Year
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Hewlett Packard Enterprise
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Senior Software Engineer
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Join Checkr in Denver as a Senior Software Engineer to build the future data platform. Leverage 5+ years of backend expertise in Ruby, Golang, or JS/TS to architect scalable systems and modernize our tech stack. Enjoy full benefits, a flexible PTO policy, and a collaborative environment where you...
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United States , Denver
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155000.00 - 182000.00 USD / Year
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Checkr
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Senior Staff Software Engineer
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Lead the architectural vision for Checkr's core systems as a Senior Staff Software Engineer. This Denver or San Francisco-based role requires 15+ years of experience to drive international expansion and enterprise architecture. You'll leverage expertise in Ruby, GoLang, and cloud technologies to ...
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United States , Denver; San Francisco
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213000.00 - 295000.00 USD / Year
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Checkr
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Senior Software Engineer
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Join Checkr in San Francisco as a Senior Software Engineer. You'll architect new platform capabilities using Ruby, Golang, or TypeScript. Drive technical excellence, system modernization, and mentor engineers. Enjoy full medical coverage, flexible PTO, and a wellness stipend.
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United States , San Francisco
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183000.00 - 215000.00 USD / Year
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Checkr
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Senior JVM Software Engineer
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Join a leading German telecom & IT innovator at their new European Tech Center in Warsaw. As a Senior JVM Software Engineer, you'll develop the Sales Cockpit backend using Java, Spring Boot, and REST APIs. Enjoy a hybrid model, flexible hours, and benefits like a cafeteria system and revenue shar...
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Poland , Warsaw
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Not provided
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Inetum
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Senior JVM Software Engineer
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Join our Kraków team as a Senior JVM Software Engineer. Design robust, scalable backend solutions using Java 8, Spring Boot, and Microservices. Enjoy a hybrid model, flexible hours, and a supportive culture with technical mentoring. Leverage your 5+ years of experience to integrate platforms and ...
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Poland , Kraków
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Not provided
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Inetum
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Senior Software Development Engineer
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Join our team in Noida as a Senior Software Development Engineer. You will maintain and optimize Oracle database applications using advanced SQL and PL/SQL. Your role includes data modeling, performance tuning, and collaborating with developers and testers. We offer an inclusive, respectful workp...
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India , Noida
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Sopra Steria
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Senior Software Engineer
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Join our London team as a Senior Software Engineer. You will design technical architecture and lead complex projects in Scala/Python, shaping the SolstiCE platform. This role offers a bonus, private medical care, and 27 days' leave. Drive efficiency and automation for our Equity Derivatives busin...
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United Kingdom , London
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Not provided
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Citi
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Senior Software Engineer
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Join Allianz Technology as a Senior Software Engineer in Trivandrum. Develop cutting-edge solutions using Java, Spring, Angular, and Microservices on cloud platforms like AWS/Azure. Enjoy a hybrid work model, performance rewards, and career growth in a global IT leader driving digitalization for ...
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India , Trivandrum
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Not provided
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Allianz
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Senior Software Engineer FX Options
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Join Citi's FX Technology team in Singapore as a Senior Software Engineer for Options Pricing. Design and develop low-latency pricing platforms using Java 11+, microservices, and Kubernetes. Mentor developers and collaborate with global teams in a front-office, Agile environment.
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Singapore , Singapore
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Not provided
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Citi
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Explore Senior Software Engineer - Systems jobs and discover a pivotal role at the intersection of software development and core infrastructure. Professionals in these positions are the architects and builders of the foundational platforms, services, and frameworks that power large-scale, reliable, and performant applications. Unlike roles focused solely on end-user features, Senior Software Engineers in Systems delve into the underlying engine, optimizing for scalability, resilience, and efficiency to support millions of users and complex data flows. Typically, individuals in this profession are responsible for designing, developing, and maintaining critical system-level software. This includes creating distributed systems, high-throughput data pipelines, low-latency services, and robust platform infrastructure. Common responsibilities involve architecting scalable solutions, conducting deep-dive performance analysis and debugging across the entire software stack, establishing engineering best practices and standards, and providing technical leadership and mentorship to other engineers. They own the full lifecycle of system components, from conceptual design and implementation to deployment, monitoring, and iterative improvement. The role demands a unique blend of deep technical expertise and strategic vision. Typical skills and requirements include extensive experience with systems programming languages such as C++, Go, Java, or Rust, and a profound understanding of computer science fundamentals like data structures, algorithms, operating systems, and networking. Expertise in distributed systems concepts—including consensus, consistency, and fault tolerance—is paramount. These engineers are proficient in profiling and debugging complex systems, often needing to trace issues from high-level application logic down to native code or kernel interactions. A performance-first mindset, experience with cloud-native technologies and containerization, and a strong grasp of CI/CD pipelines and observability tools are standard expectations. Leadership skills are crucial, as these senior professionals champion technical excellence, drive architectural decisions, and elevate the entire engineering organization through mentorship and the establishment of a culture focused on robustness and scalability. For those seeking to solve the most challenging engineering problems and build the bedrock upon which digital experiences stand, exploring Senior Software Engineer - Systems jobs offers a career path defined by high impact, continuous learning, and shaping the technological future of an organization.

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